Details:

Journal Title:
Frontiers in Aquaculture
Personal Author:
Green-Gavrielidis, Lindsay A. ; Thornber, Carol S. ; Oczkowski, Autumn
Green-Gavrielidis, Lindsay A. ; Thornber, Carol S. ; Oczkowski, Autumn Less -
NOAA Program & Office:
NMFS (National Marine Fisheries Service)
Description:
Sustainable aquaculture includes the aquaculture of non-fed crops that provide ecosystem services including nutrient extraction and water quality improvement. While shellfish are the most farmed sustainable aquaculture crops in the USA, shellfish farmers in the northeastern US have an interest in diversifying their crops and incorporating seaweeds into their farms. In this study, we worked with oyster farmers to investigate the potential for farming sugar kelp, Saccharina latissima, across different environmental regimes in coastal Rhode Island USA. Kelp seed spools were outplanted at two time points in the fall/winter of 2017 and 2018 at four sites and cultivated until harvest the following spring. Kelp performance (length, width, yield), tissue content, and nutrient extraction were determined for each line in each year; oyster growth was also measured monthly for one year at each site. We found that kelp could successfully grow in both shallow coastal lagoons and estuarine sites, although the timing of planting and placement of sites was important. Lines that were planted earlier (as soon as water temperatures<15°C) grew longer and yielded more biomass at harvest; overall, kelp blade yield ranged from 0.36 ± 0.01 to 11.26 ± 2.18 kg/m long line. We report little variation in the tissue quality (C:N) of kelp among sites, but differences in biomass production led to differences in nutrient extraction, which ranged from 0.28 ± 0.04 to 16.35 ± 4.26 g nitrogen/m long line and 8.93 ± 0.35 to 286.30 ± 74.66 g carbon/m long line. We found extensive variability in kelp growth within and between lines and between years, suggesting that crop consistency is a challenge for kelp farmers in the region. Our results suggest that, as there is a lower barrier in terms of permitting (versus starting a new aquaculture farm), it may be a worthwhile investment to add sugar kelp to existing oyster farms, provided they have suitable conditions. At current market rates of US$0.88-$3.30 per kg, farmers in southern New England have the potential to earn US$2,229 per 60 m longline. While seaweed aquaculture is growing, considerable barriers still exist that prevent wide-scale kelp aquaculture adoption by existing aquafarmers.
Source:
Frontiers in Aquaculture, 2
DOI:
https://doi.org/10.3389/faquc.2023.1147524
ISSN:
2813-5334
Format:
PDF
Publisher:
Frontiers Media SA
Document Type:
Journal Article
Funding:
Grant no. NA17NMF4270200
License:
https://creativecommons.org/licenses/by/4.0/
Rights Information:
CC BY
Compliance:
Library
Main Document Checksum:
[+]
urn:sha256:3441f64db647f3e5a608048a7eaf26059c3fce3072a7306ffd2731631769e458
Download URL:
https://repository.library.noaa.gov/view/noaa/58133/noaa_58133_DS1.pdf
File Type:

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